Circuit and chip for multiplexing oscillator frequency adjustment module and reference module

Abstract

The invention discloses a circuit and chip for multiplexing an oscillator frequency adjustment module and a reference module, and the method comprises the steps: setting the frequency adjustment module and the reference module, starting the frequency adjustment module when there is a larger frequency output requirement, enabling the charging current to be increased, and enabling the output frequency of an oscillator to be increased; and when a requirement of higher frequency output exists, reducing the reference voltage Vref of the comparator through the reference module, so that the comparator is turned over in advance, and the purpose of increasing the frequency is achieved. According to the circuit, the output frequency of the oscillator can be increased by reducing the reference voltage Vref of the comparator without further increasing the charging current of the mos tube in the circuit under the requirement of high output frequency of the oscillator, so that the mos tube is prevented from being damaged by overlarge instantaneous charging current, the service life of the mos tube in the circuit is protected, and the normal operation of the oscillator circuit is ensured.

Description

technical field [0001] The invention relates to the technical field of analog circuits, in particular to a circuit and a chip for multiplexing an oscillator frequency adjustment module and a reference module. Background technique [0002] The traditional oscillator circuit can charge the capacitor with different charging currents by controlling the closing and opening of the switch, so as to obtain different frequency outputs. However, the oscillator circuit needs a higher frequency, the charging current is very large, and a large current will flow through the mos tube of the oscillator circuit at the moment the switch is turned on, which will damage the mos tube and shorten the life of the mos tube. service life, affecting the normal operation of the oscillator circuit. [0003] Therefore, the existing technology still needs to be improved and developed. Contents of the invention [0004] The object of the present invention is to provide a circuit and chip that multiple...

AI Technical Summary

Problems solved by technology

However, the oscillator circuit needs a higher frequency, the charging current is very large, and a large current will flow through the mos tube of the oscillator circuit at the moment the switch is turned on, which will damage the mos tube and shorten the life of the mos tube. service life, affecting the normal operation of the oscillator circuit

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